package com.hmall.gateway.filter;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.util.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@EnableConfigurationProperties(AuthProperties.class)
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    private final JwtTool jwtTool;
    private final AuthProperties authProperties;
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.判断是否要拦截
        ServerHttpRequest request = exchange.getRequest();
        if (isExclude(request.getPath().toString())) {
            //无需拦截，直接放行
            return chain.filter(exchange);
        }
        //2.获取token
        String token = request.getHeaders().getFirst("authorization");
        //3.校验token
        Long userId = null;


        try {
            userId = jwtTool.parseToken(token);

            //4.todo 传递用户信息
            System.out.println("userId = " + userId);

            String userInfo = userId.toString();
            exchange.mutate().request(builder -> {
                builder.header("user-info",userInfo);
            }).build();

        } catch (Exception e) {

            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.放行
        return chain.filter(exchange);
    }

    private boolean isExclude(String path) {
        for (String excludePath : authProperties.getExcludePaths()) {
            if (antPathMatcher.match(excludePath,path)){
                return true;
            }
        }
        return false;
    }


    @Override
    public int getOrder() {
        return 0;
    }
}
